Improvement in machines for polishing the inner surfaces of cylinders



T. GOODRUM 2Sheets--Sheet1.

Improvement in Machines for Polishirig the Inner Surfaces of Cylinders.

N0.129,402. Patentedluly 16,1872.

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improvement in Machineyfor Polishingthe Inner r Surfaces of Cylinders.

No, 129,402, i Patenied July 16, I872.

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THOMAS GOODBUM, OF PROVIDENCE, RHODE ISLAND.

IMPROVEMENT IN MACHINES FOR POLISHING THE INNER SURFACES 0F CYLINDERS.

Specification forming part of Letters Patent No. 129,402, dated July16,1872.

To all whom it may concern:

Be it known that I, THOMAS GOODRUM, of the city of Providence, county ofProvidence, in the State of Rhode Island, have invented new and usefulImprovements in Machines for Polishing the Inner Surfaces of Cylinders,&c.;

and I do hereby declare the following to be a ated in diameter while inmotion inside of a cylinder, or otherwise; also to the simple andeffective devices for expanding the abovenamed wheel; an adjustableautomatic shifting apparatus, in combination with other devices,supported by a pivoted movable frame connecting with the feed-screw.

Referring to the drawing, Figure 1 represents a side view of my machine.Fig. 2 represents a front view of my machine; Fig. 3, a sectional detailof the grinding-wheel and its connections; Fig. 4, top of grinding-wheelwith part of the sections removed, showing slots in the plate; Fig. 5,enlarged details of feed-wheels and connections; Fig. 6, face of wheelsshowing shaft, sliding-pin, or clutch.

To enable others skilled in the art to make and use the same, I willdescribe by referring to the letters of reference on the drawing, inwhich A is a bed or base; 13, column; 0, extending arms supportingbearings for the spindle B; D and E, extensions for chain or ropewheels; F, rope-wheel; I, cord; K, hammer attached to rod M; N, wedge;0, expanding grinding-wheel; P, shell with a loop formed thereon;R,sleeve-pulley; S, movable platform supporting drum, worm-wheel, andcrank; H, feed-rod-or screw; T T, clutch-pulleys; V, sliding clutch-pin;W W, springs; X X, set collars; Z, shifter-rod; adjustable arms withwheels to operate the shifter; ll, movable pedestals; Ill, cams; O, camsor eccentrics.

I construct my polishing-machine from any suitable metals, and in theusual way that similar machinery is made. The base or bed and the columnare similar in form to an ordinary upright drilling-machine. The bed isprovided with radial slots, in which movable pedestals provided withlever-cams III, are secured and adjusted to support the cylinder for theoperation of polishing. The column is provided with suitable extendedarms forming bearings for the main spindle B, also supporting therope-wheels above. vided with a fixed platform, U, for the support ofthe swinging frame S. Bearings are formed at the top for the support ofthe feed-shaft or screw H and the shifter-rod Z.

The grinding-wheel O is constructed of sectional pieces, 3 3 3, of woodor metal, with their circumferential faces covered with or composed ofemery or a similar grinding material, all secured to a radially-slottedplate, 4, by means of bolts 5 5 5, as is more clearly shown in theenlarged details, Figs. 3 and 4; the conical shaped wedge N, formed withprongs W W, extending from a hub, said prongs penetrating the slots ofthe grindingwheel for the purpose of forcing outward the sections 3 3 3to enlarge its diameter. (See Fig. 3.) The hammer K, surrounding themain spindle to which the rod M and cord I are attached, is made in anysuitable form that will serve to drive the wedge N. The shiftingapparatus consists of a rod, Z, (supported by hearings in or near thebase, and at the top of the column,) to which is attached the slidingsleeves *N N, extension arms it and pulleys ll, spring 6, and collars 8,said rod being suitably curved at the top to support a movable studwhich enters the end of the feed-shaftor screw H that operates theclutch -pin. The slidingsleeves N N are formed of hollow tubes withsuitable pieces fitted into the same, serving as arms. At the end ofeach are small pulleys, to prevent abrasion when the rotatingemery-wheel comes in contact to operate the shifter. The verticalfeed-shaft or screw H should be of a suitable length to rest in bearingson the platform U and extend above sufficiently to receive twoclutch-pulleys in line parallel with the sleeve-pulley R, from whichthey are driven in opposite direction, said shaft being supported at thetop of the column, in bearings formed thereon. This shaft is providedwith a screw It is also proadjacent to the lower hearing, which meshesinto the worm-wheel P P, to revolve the same with the drum, to which itis connected, for the purpose of windin g and unwinding the cord whichcauses the spindle with the grindingwheel to feed upward or downward. Iwould remark that the worm-wheel is made to engage or disengage thescrew-shaft H by means of a cam or lever secured to the platform andconnected to the swinging-frame by any suitable means. When disengagedthe drum may be operated by hand, by means of a crank, which may beconvenient at times. I would also remark that the main spindle, to whichthe grinding-wheel O is attached in the usual manner, is provided at thetop with a flange, or shaped like a ball, for the purpose of surroundingthe same with a shell, in such a manner that the spindle may bepermitted to revolve freely. This shell may be formed with an eye, towhich a cord may be attached for the purpose of elevating or loweringsaid spindle. The sleeve-pulley R is formed with two sizes in diameter.The larger is for revolving the spindle, while the smaller serves todrive the clutch-wheels on the feed-screw. This pulley is provided withthe usual feather sliding in a groove formed in the spindle.

To enable others to use my invention, I will describe: I place the bodyor cylinder, with its opening, in a vertical position directly under thecenter of the grinding-wheel, resting the same upon the ends of thepedestals, and there clamp the same by means of the camlevers. The mainspindle, with the grindingwheel attached, is rotated, in the usualmanner, with great rapidity, and may be lowered to its work bydisengaging the worm-wheel from the feed-screw and using the crank withthe hand. The grinding-wheel should enter the cylinder slightly, and, bythe use of the hammer, which is operated by pulling the cord .for thatpurpose, the wheel may be expanded suificiently to do its work. I wouldremark that after the wheel is expanded properly to do its work theworm-wheel may engage the feed-shaft or screw, and thus operateautomatically, as, in the descent downward, the grinding-wheel is forcedagainst the shifter, or the wheel on the extension arm, which reversesthe same, and, in rising, comes in contact with the wheel above, and isthere reversed.

The object of my invention is to provide a convenient automatic grindingmachine for the use of manufacturers for finishing the inner surface ofcylinders of steam-engines and pumps more perfectly than has heretoforebeen accomplished by other means. Prior to my invention the cylinders oflarge engines and pumps have almost invariably been left in the samerough condition as when taken from the boring-lathe, in consequence ofthe lack of proper means or machinery for a better finishing. Myinvention enables me to finish the inner surface of a cylinder in themost perfect manner and with as fine a polish as is possible to beobtained on the outer surface of anybody. Consequently, a better engineor pump is the result.

Having thus described my invention, I claim- 1. An automaticalpolishing-machine provided with the revolving shaft B, grindingwheel 0,wedge N, and hammer K, as and for the purposes set forth.

2. The adjustable sliding arm in combination with the shifting-rod Z,operated by the rotating grinding-wheel O, for moving the v clutch toengage pulleys T T, as and for the purposes set forth.

3. The sliding platform S supporting the drum 8 and worm-wheel P P, towhich the screw H is made to engage or disengage by means of lever O, asand for the purpose set forth.

4. The expanding grinding-wheel O, consisting of plate 4, to which areattached movable sections 3 3 3 3, of suitable grinding material andmetal, secured by bolts 5 5 5 5, operated by wedge N and hammer K,as'and for the purposes herein set forth.

THOS. GOODRUM.

Witnesses:

WALTER B. VINCENT, NATHANIEL L. MORGAN.

